1,9-Thianthrenedicarboxylic acid from Japan
1,9-Thianthrenedicarboxylic acid is a polycyclic aromatic heterocyclic compound with sulfur bridges and carboxylic acid groups. Explicitly named in HTS 2934.99.05.00 under 'other heterocyclic compounds: aromatic.' Used in specialty dyes and advanced material synthesis.
Duty Rate — Japan → United States
21.7%
Rate breakdown
9903.04.629.2%Patented pharmaceutical articles that are the product of Japan, of a European Union member country, of South Korea, of Switzerland, or of Liechtenstein as provided for in subdivisions (c) and (f) of U.S. note 40 to this subchapter
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide molecular weight and carboxylic acid titration data to confirm identity and acid-function classification
• Ensure proper corrosion-resistant packaging due to carboxylic acid properties during ocean freight
• Declare exact CAS registry number to prevent confusion with thianthrene derivatives in other subheadings